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Latest News Electronic Throttle Bodies What the technicians need to know when diagnosing Electronic Throttle Body faults whilst the vehicle is in a “Reduced Engine Power” mode. Many a throttle body has been unnecessarily renewed due to not correctly carrying out basic power supply and ground tests on the throttle bodies and related circuits that may indicate a simple fault that can be rectified without renewing the throttle body. Typical example:
What information does the Technician require prior to carrying out any tests?
For this vehicle example, the fuse supplies power to both the Engine PCM (TBO circuit) as well as the O2 sensor heater circuit. All throttle body terminals are directly connected to the PCM so it is important that power supply to the PCM is acceptable.
Testing Procedure requirements : checking voltage supply readings at fuses / PCM or O2 sensor heater terminals must be carried out when the circuit is operating (electrically loaded). Note: testing the voltage (with no electrical load) may indicate a near normal (or slightly lower) voltage reading on a circuit with a high resistance problematic point within the circuit. This may prevent the true condition to be disclosed causing incorrect diagnosis. The PCM may generally utilise a separate ignition voltage supply that will create a Reduced Engine Power mode if the PCM detects a reduced voltage difference between the 2 circuits. Cause of fault: Replacing the relay and cancelling the fault codes allowed the engine to perform normally on a road test. Typical TBO fault codes that may be created by a faulty electronic TBO. Codes P2111 and P2112 are common on throttle bodies on vehicles that have achieved high kilometres. A typical example of this fault condition may be commonly found on a Chrysler throttle body. Removing the TPS cover and investigating the intermediate gear may disclose damage to the gear assembly. Renewing the throttle body is the only option for this condition. Codes P2111 & P2112 Chrysler 2.4 Electronic Throttle Body replacement.
Removing the TPS cover plate to carry out internal investigation of the TBO. If the cover is to be removed from the TBO unit that is retained by spring loaded clips (typical GMH unit) it is important that the retaining clips are replaced in the correct order during reassembly. It is advisable to ensure the intermediate gear is not removed, but if it must be removed that it is placed in the same original position. Note: The TPS drive points must be aligned correctly prior to reassembly to prevent any internal damage.
A typical manufacturers sequence procedure may be: (GM.)
After refitting the TBO to the vehicle, ensure the post fitting procedures are carried out to ensure customer satisfaction. The Premier Auto Trade Emission range includes more than 130 Throttle Bodies (TBO), covering almost 6.5 million vehicle applications in Australia and NZ. When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups. |
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